All of these measures prove inadequate when Prince George of England is attacked by an armed anarchist who mistakes him for Nicholas. As a result, Barker and Llewelyn are brought in to help track down the assassin and others who might conspire against the life of the Tsesarevich. The investigations lead them down several paths, including Llewelyn's old nemesis, the assassin Sofia Ilyanova. With Barker and Llewelyn both surviving separate attempts on their lives, the race is on to find both the culprit and the assassin they hired. Taking them through high society (including a masked ball at Kensington Palace) and low, chasing down motives both personal and political, Barker and Llewelyn must solve the case of their life before the crime of the century is committed.
